EP2984327B1 - Unité d'injection bicarburant et agencement d'alimentation bicarburant - Google Patents

Unité d'injection bicarburant et agencement d'alimentation bicarburant Download PDF

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Publication number
EP2984327B1
EP2984327B1 EP13723180.9A EP13723180A EP2984327B1 EP 2984327 B1 EP2984327 B1 EP 2984327B1 EP 13723180 A EP13723180 A EP 13723180A EP 2984327 B1 EP2984327 B1 EP 2984327B1
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EP
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Prior art keywords
fuel
section
control
valve
fuel injection
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EP13723180.9A
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German (de)
English (en)
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EP2984327A1 (fr
Inventor
Franco CAVRESSI
Dave Jay
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Wartsila Finland Oy
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Wartsila Finland Oy
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0003—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure
    • F02M63/0005—Fuel-injection apparatus having a cyclically-operated valve for connecting a pressure source, e.g. constant pressure pump or accumulator, to an injection valve held closed mechanically, e.g. by springs, and automatically opened by fuel pressure using valves actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
    • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
    • F02M63/0275—Arrangement of common rails
    • F02M63/0285—Arrangement of common rails having more than one common rail
    • F02M63/029—Arrangement of common rails having more than one common rail per cylinder bank, e.g. storing different fuels or fuels at different pressure levels per cylinder bank
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B15/00—Engines characterised by the method of introducing liquid fuel into cylinders and not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B9/00—Engines characterised by other types of ignition
    • F02B9/02—Engines characterised by other types of ignition with compression ignition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0686—Injectors
    • F02D19/0692—Arrangement of multiple injectors per combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
    • F02D19/10—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels peculiar to compression-ignition engines in which the main fuel is gaseous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0064—Layout or arrangement of systems for feeding fuel for engines being fed with multiple fuels or fuels having special properties, e.g. bio-fuels; varying the fuel composition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/02—Pumps peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar thereto
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0028—Valves characterised by the valve actuating means hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/40—Fuel-injection apparatus with fuel accumulators, e.g. a fuel injector having an integrated fuel accumulator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/95—Fuel injection apparatus operating on particular fuels, e.g. biodiesel, ethanol, mixed fuels
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Definitions

  • the present invention relates to a fuel injection unit in accordance with the preamble of claim 1.
  • the present invention relates also to a fuel feeding arrangement in accordance with the preamble of claim 9.
  • a so called “common rail injection” or “common pressure injection” is known as such for injecting fuel into a combustion chamber of internal combustion piston engines.
  • the provision of pressurize the fuel and controlling the injection of fuel are functionally separated from each other.
  • Fuel is fed by means of at least one high pressure fuel pump into a pressure supply, i.e. rail, from which it is led through separate pipes into the injector or injection valve of each cylinder.
  • a pressure supply i.e. rail
  • the operation of an injector is electronically controlled, for instance by means of a solenoid or piezoelectric valve, in order to obtain a sufficiently short and precise injection.
  • a number of the most obvious problem areas of traditional fuel feeding systems have been solved by the use of a high pressure (up to about 2200 bar) fuel supply, and electronically controlled fuel injection valves by means of which it is, for instance, possible to inject fuel into an engine cylinder several times during the same combustion stroke.
  • the timing of the injection, the duration of the injection and the quantity of injected fuel is in clearly better control than with the fuel injection pumps of prior art, whereby also the emission levels in normal operating conditions of a piston engine have been drastically reduced.
  • a piston engine operate by making use of two different fuels.
  • a gaseous fuel such as natural gas is used as the main fuel and a liquid fuel, such as LFO or diesel fuel oil, is used to ignite the mixture of air and gaseous fuel present in the combustion chamber of the engine.
  • a liquid fuel such as LFO or diesel fuel oil
  • EP 0778410 B1 discloses an injection valve arrangement for an internal combustion engine, especially a large so called gas diesel engine.
  • the arrangement comprises an engine cylinder head, first valve means in the form of at least two needle valves or the like for injecting gaseous fuel directly into a cylinder of the engine.
  • second valve means in the form of a needle valve or the like, for injecting so called pilot fuel into the cylinder in order to enrich the mixture therein for ignition.
  • Control of the operation of the gas needle valves is arranged by means of a common control valve preferably under electrical control.
  • the valve needles of the gas needle valves are mechanically connected to each other so that the movements thereof occur concurrently.
  • WO 01/79685 A2 discloses a hydraulically actuated dual fuel injector for separately injecting a first fuel and a second fuel into a combustion chamber.
  • the injector comprises a first fuel inlet port for a first liquid fuel and a second inlet port for a second gaseous fuel.
  • a first injection valve disposed within the injector body is fluidly connected to the first fuel port for controlling injection of the first liquid through a first fuel ejection port.
  • a second injection valve is fluidly connected to the second inlet port for controlling injection of the second gaseous fuel through a second fuel ejection port.
  • a first two-way valve controls the flow of the hydraulic fluid to actuate the first injection valve and a second control valve controls the flow of the hydraulic fluid to actuate the second injection valve.
  • WO 2012/072881 A1 discloses a fuel injection unit for a large internal combustion engine having a common rail fuel system.
  • the fuel injection unit connected to the common rail fuel system mainly comprises a first fuel injection valve with a first control valve and a second fuel injection valve with a second control valve.
  • the fuel injection unit further comprises a high pressure accumulator for providing said first fuel injection valve and said second fuel injection valve with fuel.
  • a piston engine operating as prime mover to run a generator for producing electricity may be adapted to use various different fuels. There is a need to provide fuel injection system for a large engine capable of using methane as primary fuel.
  • An object of the present invention is to provide a fuel injection unit and arrangement using the unit which provides improved performance in dual fuel piston engine particularly using liquid alcohol, such as methanol as its fuel.
  • large engine refers to such internal combustion engines in which more than 150kW power per cylinder may be generated.
  • this kind of large engines are used, for example, as main propulsion engines or auxiliary engines in marine vessels or in power plants for the production of heat and/or electricity.
  • LFO, MDO, diesel fuel oil or alike are commonly called as LFO in this context.
  • a fuel injection unit for assembly to a cylinder head and for injecting first and second fuel to a cylinder of an internal combustion piston engine
  • the fuel injection unit comprising a first fuel feeding section for using liquid alcohol fuel, a second fuel feeding section for using liquid fuel, a pressure accumulator in the first fuel feeding section, a flow fuse arranged in the first fuel feeding section between the pressure accumulator and a fuel injection valve of the first fuel feeding section.
  • the fuel injection valve comprises a fuel handling section and control section, as defined in claim 1.
  • the fuel handling section is arranged to handle the introduction and metering the liquid alcohol fuel into the combustion chamber by at least one control needle in the fuel injection valve and that the control section is a hydraulic control section fluidly separated from the fuel handling section.
  • the second fuel feeding section is arranged to a pilot i.e. ignition fuel for compression ignition purposes.
  • the amount of pilot fuel injected may be 1 to 5% of the LFO specific fuel oil consumption in diesel mode at maximum load of the engine.
  • the second fuel feeding section may also be used alone as backup system in diesel mode.
  • the fuel injection unit is provided with a flow channel for the control fluid separated from the first fuel section connected to a control valve external to the fuel injection unit.
  • the pressure of the control fluid is arranged to determine the operational status of the injection valve when in use.
  • the unit comprises at least two successive parts and the first fuel section extends from the first part to the second part and that the crossover location comprises a first sealing system and that the first sealing is surrounded by a sealing chamber connectable to a source of sealing liquid when in use.
  • the first fuel section between the flow fuse and the fuel injection valve is arranged to cause a pressure loss of less than 200 bar in all operational circumstances of the valve unit.
  • control section is provided with a control valve, which is arranged to apply the pressure of control fluid system to the control section of the valve which causes closing of the at least one control needle, and to depressurize the control section, which causes the opening of the at least one control needle.
  • a fuel feeding arrangement comprising a first fuel system with at least one high pressure fuel pump which is arranged to pressurize the fuel to the injection pressure, and a second fuel system with at least one high pressure fuel pump which is arranged to pressurize the fuel to the injection pressure.
  • the arrangement comprises a fuel injection unit according anyone of the claims 1 - 8, and the control section is provided with a control valve, which is arranged to apply the pressure of control fluid system to the control section of the valve which causes closing of the at least one control needle, and to depressurize the control section, which causes the opening of the control needle and that the control valve is arranged externally to the valve unit.
  • control section is connected with the control valve by an external pipe.
  • the valve unit comprises at least two successive parts and that the first fuel section extends from the first part to the second part and that the crossover location comprises a first sealing system and that the first sealing is surrounded by a sealing chamber connectible to a source of sealing liquid when in use, wherein the sealing chamber is connected to an external source of sealing liquid.
  • the first fuel system comprises a secondary pressure accumulator dedicated for the first fuel feeding section of the fuel injection unit.
  • the total volume of the integrated accumulator and the secondary accumulator is designed so that their capacity is of 20 to 60 times the injection quantity during one combustion stage.
  • Figure 1 describes a fuel feeding arrangement 10 in an internal combustion engine 12, which engine is depicted only by a schematic partial presentation of a cylinder and a cylinder head.
  • the fuel feeding arrangement comprises a fuel injection unit 14, which is suitable for assembly to the cylinder head of an engine, and, in the figure 1 being assembled in such a cylinder head.
  • the fuel feeding arrangement 10 comprises a first fuel system 16 with at least one high pressure fuel pump 18 which is arranged to pressurize the first fuel to the injection pressure, and a second fuel system 20 with at least one high pressure fuel pump 22 which is arranged to pressurize the second fuel to the injection pressure.
  • the first fuel system is arranged to feed liquid alcohol, such as methanol and the second fuel system is arranged to feed LFO.
  • the fuel injection unit 14 comprises two separate fuel feeding sections 30, 40 for separate fuels.
  • the fuel injection unit 14 is provided with communication ports 309, 310, 311,312 via which the unit is coupled to the external system.
  • the second fuel feeding section 40 in all the embodiment of the invention may be any fuel injection system apparent to a skilled person in the art suitable for injection LFO as a pilot i.e. ignition fuel for compression ignition purposes.
  • the second fuel feeding section 40 comprises an injection needle 401 which may be used for injecting pilot fuel when the engine is operating in dual fuel mode or main fuel when the engine is operating in diesel mode. In the figure the injection needle is controlled by fuel pressure against a spring force.
  • the first fuel feeding section 30 is coupled to the first fuel system 16 of the engine, and the second fuel feeding section 40 is coupled to the second fuel system 20.
  • the first fuel feeding system 16 and the fuel feeding section 30 of the unit are adapted to handle liquid alcohol, such as methanol, and the second fuel injection system 20 and the fuel feeding section 40 of the fuel injection unit 10 are adapted to handling LFO.
  • the second fuel system 20 and the second fuel feeding section 40 of the injection unit 14 are used as pilot system by means of which a small amount of LFO may be injected into the combustion chamber to ignite the combustible mixture therein when the unit is used in dual fuel mode.
  • the valve unit is a dual fuel injection unit arranged to inject two separate fuels in successive order at least once during each combustion stage of a cylinder in the engine.
  • Both fuels are injected via the same unit 10 directly into a combustion chamber of the engine.
  • the second fuel system 20 and the second fuel feeding section 40 of the injection unit 14 may also be used alone for injecting main fuel e.g. as a backup system when the engine is operated in diesel mode.
  • the first fuel feeding section 30 of the fuel injection unit 10 comprises a first fuel injection valve 301 arranged at a first end of the injection unit 10, which is assembled to open in the combustion chamber.
  • the fuel injection valve 301 comprises a fuel handling section 302 and control section 303.
  • the fuel handling section 302 is arranged to handle the introduction and metering of the liquid alcohol fuel into the combustion chamber by a control needle 306 in the valve 301.
  • a control needle 306 in the valve 301.
  • FIG. 1 there is shown only one control needle 306, but the number of control needles 306 as well as injection valves 301 may be different in different applications.
  • the injection needle 401 of the second fuel feeding section 40 is arranged to the middle area of the valve unit 14 and the fuel injection valves 301 of the first fuel feeding section 30 are placed symmetrically around the injection needle 401 of the second fuel feeding section 40.
  • the first fuel feeding section 30 may comprises several injection valves 301 including the control section 303 and the fuel handling section 302.
  • the control section 303 of the injection valve 301 may be arranged to control several fuel handling sections 302.
  • the control needles 306 of several fuel handling sections 302 are mechanically connected to a single actuation piston of the control section 303.
  • the control section 303 is a hydraulic control section arranged control the operation i.e. position of the control needle 306.
  • the control section is arranged to operate in hydraulic manner the fuel section with a control fluid which is separate from the fuel in the fuel section.
  • the control section is a hydraulic control section fluidly separated from the fuel handling section.
  • there is a sealing arrangement between the sections Such a sealing arrangement may be sealing arrangement apparent to a skilled person in the art.
  • the fuel injection valve 301 is this way adapted to operate with and inject methanol.
  • the control section 303 is connected to a control fluid system 304 which is arranged to produce pressurized control fluid for the control section 303.
  • the control section 303 is provided with a control valve 305, which is arranged to apply the pressure of control fluid system 304 to the control section 303 of the valve 301 which causes closing of the control needle 306, and to depressurize the control section 303, which cases opening of the control needle 306.
  • the control section comprises for example an arrangement in which the control fluid is acting on a piston being capable to lift the piston and the control needle 306 up against a spring's force when pressurised.
  • the piston is mechanically connected to the control needle 306 and to the free end of the spring that keeps it down when the control section 303 is not pressurised.
  • the control valve 305 is arranged externally to the valve unit 10 connected to a communication port 309 in the fuel injection unit 14 operating as an inlet of the control section 303 for the fuel injection unit 10.
  • the control valve 305 is arranged into an external pipe 332 which is provided with a pump 334. This way a more efficient use of the space under a rocker cover cap of the engine is achieved.
  • the control valve 305 is an electronically operated 3/2- way valve.
  • lubrication oil is used for both the source of sealing liquid 318 and the control fluid system 304, whether being separate or combined system.
  • the fuel injection unit 10, and more specifically the first fuel feeding section 30 thereof, comprises a pressure accumulator 307 integrated within the fuel injection body of the injection unit 10.
  • the first fuel system 16 comprises a secondary pressure accumulator 24 dedicated for the first fuel feeding section 30 of the fuel injection unit 10.
  • the total volume of the integrated accumulator 307 and the secondary accumulator 24 is designed so that the capacity is of 20 to 60 times the injection quantity during one combustion stage.
  • the total volume is shared between the internal accumulator 307 and the secondary pressure accumulator 24 case by case as necessary.
  • the first fuel feeding section 30 is designed so that not more than 200 bar pressure drop between the accumulator 307 and the injection valve 301 may emerge during one injection.
  • Flow fuse valve 308 arranged between the accumulator 307 and the injection valve 301.
  • Flow fuse valve is a device allowing only a predetermined amount of fluid flow at one instance and its design is apparent to a skilled person in the art.
  • the flow fuse valve 308 is integrated within the body of fuel injection unit 10, in close proximity of a gallery of the fuel injection valve 301. This arrangement allows only minimal amounts of residual methanol leakage in case of a failure in the needle valve functionality.
  • the fuel injection unit 14 comprises at least two parts 14.1, 14.2.
  • the first fuel section 30 extends from the first part 14.1 to the second part 14.2.
  • the crossover location of the first fuel feeding section 30 at the boundary between the parts 14.1, 14.2 comprises a first sealing system 314 circumscribing the conduit.
  • a view A along the plane of the boundary at the crossover location.
  • a chamber 316 is arranged surrounding the sealing system 314.
  • the chamber is here annular but the form may be of different form.
  • the chamber is formed e.g. by providing grooves to the parts of the unit facing each other.
  • the chamber 316 is connected to an external source of sealing liquid 318, preferably oil via an external communication line 320 of pressurised sealing oil.
  • the secondary accumulator 24 in the first fuel feeding system 16 there may be special cases when the pressure accumulator 307 which is integrated within the fuel injection body of the injection unit 10 constitutes the total accumulator volume for the injection unit 14. Also in this embodiment the accumulator 307 is designed so that the capacity is of 20 to 60 times the injection quantity during one combustion stage, and the first fuel feeding section 30 is designed so that not more than 200 bar pressure drop between the accumulator 307 and the injection valve 301 may emerge during one injection.
  • the communication line is provided with a pressurizing means, such as a pump 322 and a pressure monitoring and control system 324, 326.
  • a pressurizing means such as a pump 322 and a pressure monitoring and control system 324, 326.
  • This may be operated so that the chamber 316 is pressurized to a pressure which is higher than the pressure of the fuel in the first fuel feeding section 30 at least at the location of the crossover.
  • the pressure is monitored by the pressure monitoring system 324,326 and maintained at desired level by the pump 322 Since the pressure of the sealing oil 318 is higher than the pressure of the fuel in the feeding section 30 the sealing oil may escape to the fuel feeding section 30 and is combusted in the engine.
  • the pressure monitoring system comprises a pressure sensor connected to a process controller 326.
  • the process controller in case a leak is detected e.g. by detecting superfluous operation time of the pump, the process controller will force the engine to immediately switch its mode of operation from methanol mode to diesel mode, while at the same time the sealing oil pressure would be still maintained at its normal set level.
  • FIG 1 there is also shown an embodiment in which the sealing functionality of the sealing fluid is extended to the needle guide, preventing any liquid alcohol from leaking upwards past the needle gallery.
  • This is represented in the figure by a communication line 330 which connects the sealing oil groove or the chamber 316 to the fuel handling section 302 of the fuel injection valve 301.
  • the sealing fluid to the needle guide may be led also by a dedicated line (not shown) from the external communication line 320. This provides an advantageous system for preventing alcohol base fuel leakage to the control fluid.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (12)

  1. Unité d'injection de carburant (14) pour le montage sur une culasse de cylindre et pour injecter des premier et deuxième carburants dans un cylindre d'un moteur à piston à combustion interne, l'unité d'injection de carburant (14) comprenant :
    - une section d'alimentation d'un premier carburant (30) pour l'utilisation d'un carburant à alcool liquide,
    - une section d'alimentation d'un deuxième carburant (40) pour l'utilisation d'un carburant liquide,
    - un accumulateur de pression (307) dans la section d'alimentation de premier carburant (30),
    - un limiteur d'écoulement (308) disposé dans la section d'alimentation de premier carburant (30) entre l'accumulateur de pression et une soupape d'injection de carburant (301) de la section d'alimentation de premier carburant (30), dans laquelle la soupape d'injection de carburant (301) dans la section d'alimentation de premier carburant (30) comprend une section de gestion de carburant (302) et une section de commande (303),
    caractérisée en ce que
    - la section de gestion de carburant (302) est étudiée pour gérer l'introduction et le mesurage du carburant à alcool liquide dans la chambre de combustion grâce à au moins un pointeau de commande (306) dans la soupape d'injection de carburant (301), et en ce que la section de commande (303) est une section de commande hydraulique séparée fluidiquement de la section de gestion de carburant (302).
  2. Unité d'injection de carburant (14) selon la revendication 1, caractérisée en ce que la section d'alimentation de deuxième carburant (40) est étudiée en tant que pilote, c.à.d. un carburant d'allumage pour des besoins d'allumage par compression.
  3. Unité d'injection de carburant (14) selon la revendication 1, caractérisée en ce que l'unité d'injection de carburant (14) est dotée d'un canal d'écoulement (328) pour le fluide de commande séparé de la section de premier carburant (30) et pouvant être raccordé à une soupape de commande (305) externe à l'unité d'injection de carburant (14).
  4. Unité d'injection de carburant (14) selon la revendication 1, caractérisée en ce que la pression du fluide de commande est étudiée pour déterminer le statut opérationnel de la soupape d'injection (301) lorsqu'en utilisation.
  5. Unité d'injection de carburant (14) selon la revendication 1, caractérisée en ce que l'unité (14) comprend au moins deux parties successives (14.1, 14.2) et en ce que la section de premier carburant (30) s'étend de la première partie (14.1) vers la deuxième partie (14.2) et en ce que l'emplacement de croisement comprend un premier système d'étanchéification (314) et en ce que la première étanchéification est entourée par une chambre d'étanchéification (316) pouvant être raccordée à une source de liquide d'étanchéification lorsqu'en utilisation.
  6. Unité d'injection de carburant (14) selon la revendication 1, caractérisée en ce que la section de premier carburant (30) entre le limiteur d'écoulement (308) et la soupape d'injection de carburant (301) est étudiée pour causer une perte de pression de moins de 200 bars dans toutes les circonstances opérationnelles de l'unité de soupape (14).
  7. Unité d'injection de carburant (14) selon la revendication 1, caractérisée en ce que la section de commande (303) est dotée d'une soupape de commande (305) qui est étudiée pour appliquer la pression du système de fluide de commande à la section de commande (303) de la soupape (301) ce qui cause la fermeture d'au moins un pointeau de commande (306), et pour dépressuriser la section de commande (303), ce qui cause l'ouverture d'au moins un pointeau de commande (306).
  8. Agencement d'alimentation en carburant (10) comprenant un système de premier carburant (16) avec au moins une pompe à carburant haute pression (18) qui est étudiée pour pressuriser le carburant à la pression d'injection, et un système de deuxième carburant (20) avec au moins une pompe à carburant haute pression (22) qui est étudiée pour pressuriser le carburant à la pression d'injection,
    caractérisé en ce que l'agencement comprend une unité d'injection de carburant (14) selon l'une quelconque des revendications précédentes, et en ce que la section de commande (303) est dotée d'une soupape de commande (305) qui est étudiée pour appliquer la pression du système de fluide de commande à la section de commande (303) de la soupape (301) ce qui cause la fermeture d'au moins un pointeau de commande (306), et pour dépressuriser la section de commande (303), ce qui cause l'ouverture d'au moins un pointeau de commande (306), et en ce que la soupape de commande (305) est disposée de façon externe à l'unité de soupape (14).
  9. Agencement d'alimentation en carburant (10) selon la revendication 8, caractérisé en ce que la section de commande (303) est raccordée à la soupape de commande (305) par un tuyau externe (328').
  10. Agencement d'alimentation en carburant (10) selon la revendication 8, caractérisé en ce que l'unité de soupape (14) comprend au moins deux parties successives (14.1, 14.2) et en ce que la section de premier carburant (30) s'étend de la première partie (14.1) vers la deuxième partie (14.2) et en ce que l'emplacement de croisement comprend un premier système d'étanchéification (314) et en ce que la première étanchéification est entourée par une chambre d'étanchéification (316) pouvant être raccordée à une source de liquide d'étanchéification lorsqu'en utilisation, dans lequel la chambre d'étanchéification (316) est raccordée à une source externe de liquide d'étanchéification (318).
  11. Agencement d'alimentation en carburant (10) selon la revendication 8, caractérisé en ce que le système de premier carburant comprend un accumulateur de pression auxiliaire (24) dédié à la section d'alimentation en premier carburant (30) de l'unité d'injection de carburant (10).
  12. Agencement d'alimentation en carburant (10) selon la revendication 11, caractérisé en ce que le volume total de l'accumulateur intégré (307) et de l'accumulateur auxiliaire (24) est conçu de manière à ce que la capacité soit de 20 à 60 fois la quantité d'injection pendant une phase de combustion.
EP13723180.9A 2013-04-09 2013-04-09 Unité d'injection bicarburant et agencement d'alimentation bicarburant Active EP2984327B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2013/050387 WO2014167166A1 (fr) 2013-04-09 2013-04-09 Unité d'injection bicarburant et agencement d'alimentation bicarburant

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EP2984327A1 EP2984327A1 (fr) 2016-02-17
EP2984327B1 true EP2984327B1 (fr) 2017-06-21

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EP (1) EP2984327B1 (fr)
WO (1) WO2014167166A1 (fr)

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DE102018211510A1 (de) * 2018-07-11 2020-01-16 Robert Bosch Gmbh Injektor zur Einspritzung eines Fluids unter hohem Druck

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Also Published As

Publication number Publication date
EP2984327A1 (fr) 2016-02-17
US10539107B2 (en) 2020-01-21
WO2014167166A1 (fr) 2014-10-16
US20160061169A1 (en) 2016-03-03

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